Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1074fd736436f1c49063b545d2116b466051a99f552d52c93e8dc5aa1fbbbc1' 
  AND token = 'QUY+0QcvlJKGaDZ/iD1NE2aWJpaO18Nbmb8a8GcytYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}